If you use a true "coil over" shock, then the stock spring and strut are thrown away. If you simply replace the struts, then the spring is re-used.
If you're only increasing weight by 250 lbs over stock, then I'd suggest replacing the struts with Bilstein Heavy Duty (which are equal to the upgraded M030 struts) and re-use the stock spings.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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